BOSTON — Left-hander Franklin Morales is scheduled to pitch for Triple-A Pawtucket on Saturday and Sunday as he continues his rehab from a left pectoralis strain. That probably won't be all for Morales, though.

Red Sox manager John Farrell wants Morales to get some length before a return to the majors.

"Well the one thing we have to do, and just my view, is that he’s thrown two innings of I think 13 and 15 pitches," Farrell said. "So we’d love to say that when he comes back to us he’d be that efficient, but I think you still have to get him a little extended. He’s had such a start-and-stop year that we want to be sure that he’s at least answered a few question in this rehab assignment he’s on right now. The progression that he’s on is a pretty normal one. A couple outings and then back-to-back and then we’ll reassess where he’s at."

When the Sox get Morales back, they may have a tough call to make: Matt Thornton and Craig Breslow aren't going anywhere. That's two lefties. Drake Britton makes three, and he's pitched very well, but he has options.

Are four southpaws in one bullpen viable?

"That's one scenario, but we also have to get the best balance with the limited slots available out there," Farrell said. "I think first and foremost is that Franklin gets to a point where we make the necessary decision at that time."

• Right-hander Anthony Ranaudo was promoted to Triple-A Pawtucket on Friday. The 39th overall draft pick in 2010 turns 24 in September, and he sits around 93 mph, so he could well be in the majors before long — perhaps toward the end of the month. He's not yet on the 40-man roster, but will need to be added to it this offseason to protect him from the Rule 5 draft.

Ranaudo was 8-4 with a 2.95 ERA in 19 starts, with 106 strikeouts and 40 walks in 109 2/3 innings.

Lefty Henry Owens, who dominated at High-A Salem, was promoted to Double-A Portland earlier in the week.

"Well, both guys as I’m sure everyone knows, they’ve both advanced a level," Farrell said. "You know Owens, gosh I think there’s probably been three or four times he’s walked to the mound and thrown no-hit performances, whether it’s been five, six innings at a time. He’s probably one of the top pitching prospects in our system. He’s been very strong.

"And I think Raunado has had a little bit of a turn around particularly after the year he had last year. He’s remained healthy first and foremost. But the velocity has climbed. He’s pitching I think to the projection that made him a first-round pick back in 2010. So we’ve had a number of individual guys in our system have very good years and those are two of them."

• Jake Peavy doesn't have a hard pitch count for Saturday, but he's made only two starts after sitting out for a month and a half because of a rib injury.

"The stress of the pitches that he throws tomorrow will have an effect on how deep he goes," Farrell said. "But I know after being down six weeks he threw a couple bullpens, he went out of rehab, he jumped up pretty quick in his pitch count. So his last start I think he threw 117 or right around there. It was a quick advancement to that number. There’s not a number that says he has to come off the mound tomorrow. But, like every starter, we’ll monitor it close and we’ll see how his stuff is playing against Arizona tomorrow."

• Farrell said of Thursday night's 8-7 walk-off: "There was a time this morning just sitting around having a cup of coffee thinking, 'Still can’t believe we won last night.'"

He said he would not have argued Thursday if the umpires allowed acting Mariners manager Robby Thompson to put the pitcher in the game that he wanted in — Yoervis Medina, a right-hander — instead of left-hander Oliver Perez. Medina came out of the bullpen, but Thompson had actually signaled for a left-hander, and the umpire made him stick to that.